Flora of North America species comparison

15-65 cm, erect to ascending, usually puberulent;

nodes 4-6, mostly concealed, glabrous.

40-140 cm, usually somewhat decumbent;

nodes 4-7, mostly exposed, usually glabrous, occasionally puberulent.

evenly distributed;

sheaths glabrous or white-villous;

auricles usually present, 0.5-1.5 mm;

ligules to 1 mm, truncate, entire or lacerate;

blades 1.5-4(5) mm wide, often ascending and involute, adaxial surfaces scabrous, pilose, or villous.

evenly distributed;

sheaths usually glabrous and smooth, occasionally scabridulous or retrorsely hairy, sometimes purplish;

auricles to 1.5 mm, often absent;

ligules to 1 mm;

blades 4-12 mm wide, lax, usually deep green, adaxial surfaces usually pilose or villous, occasionally puberulent or scabridulous.

5-20 cm long, 5-15 cm wide, erect, sometimes partially enclosed at the base, with 2 spikelets per node, rarely with 3-4 at some nodes;

internodes 3-5(8) mm long, 0.1-0.3 mm thick at the thinnest sections, glabrous beneath the spikelets.

6-20 cm long, 0.5-2 cm wide, nodding to pendent, with 2 spikelets per node, rarely with 3 at some nodes;

internodes 3-10(12) mm long, 0.2-0.7 mm thick at the thinnest sections, usually glabrous, sometimes sparsely hairy.

10-15 mm, divergent, with 2-4 florets, lowest florets sterile and glumelike in 1 or both spikelets at each node;

disarticulation initially at the rachis nodes, subsequently beneath each floret.

12-20 mm, appressed to divergent, sometimes purplish at higher latitudes, with 2-4(7) florets, lowest florets functional;

disarticulation above the glumes and beneath each floret.

subequal, (10)30-100 mm including the awns, the bases indurate and glabrous, glume bodies (2)5-10 mm long, 1-2 mm wide, setaceous, 2-3-veined, margins firm, awns (8)25-90 mm, each split into 3-9 unequal divisions, scabrous, flexuous to outcurving from near the glume bases at maturity;

fertile lemmas 8-10 mm, smooth or scabrous near the apices, 2 lateral veins extending into bristles to 10 mm, awns (10)20-110 mm long, about 0.2 mm wide at the base, divergent to arcuate;

paleas 7-9 mm, veins usually extending into about 1 mm bristles, apices acute to truncate;

anthers 1-2 mm.

equal or subequal, the bases flat, occasionally indurate for 0.5 mm, veins usually evident, glume bodies (4.5)7-10(11) mm long, 0.7-1.5 mm wide, linear-lanceolate, entire, widening or parallel-sided above the base, 3-5-veined, usually scabridulous to scabrous, veins occasionally hirsute beyond midlength, margins hyaline or scarious, awns 1-10 mm, straight;

lemmas 7-14 mm, smooth or scabridulous, lateral veins hairy, margins hairy beyond midlength, marginal hairs 0.5-1 mm, longer than those elsewhere, awns (2)8-30 mm, flexuous to moderately outcurving;

paleas 6-13 mm, with hairs of varying lengths on the keels and apices, acute, bidentate;

anthers 2-3.5 mm.

from late May to June.

from May to July.

= 28.

= 28.